Reduced lung function in midlife and cognitive impairment in the elderly
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1 Page 1 of 5 Reduced lung function in midlife and cognitive impairment in the elderly Giuseppe Verlato, M.D. Ph.D Department of Diagnostics and Public Health University of Verona Verona, Italy Mario Olivieri, M.D. Occupational Medicine University Hospital of Verona Verona, Italy In recent years the interpretation of respiratory diseases has shifted from localized entities to single components of systemic multimorbidities (1, 2). Respiratory diseases have been linked first to cardiovascular and metabolic diseases (3, 4) and later also to cognitive disorders (5). Here, Lutsey and colleagues (6) used a community-based cohort enrolled in the frame of Atherosclerosis Risk in Communities (ARIC) study (7), to address the association between respiratory and neurological disorders. They found that both restrictive and, to a lesser extent, obstructive lung disease were associated with greater risk of incident dementia and mild cognitive impairment (MCI) after a 27-year follow-up. Lung function parameters, forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) percent predicted, were significantly associated with cognitive impairment from both Alzheimer s disease and cerebrovascular disease, although the latter association was much stronger than the former (Tables 4 and 5). The present results confirm and enlarge the findings of a previous longitudinal ARIC study (5), which had found that restrictive ventilatory pattern, but not obstructive pattern, was
2 Page 2 of 5 associated with reduced cognitive scores and higher risk of dementia hospitalization. The present study, using a longer follow-up and including also patients with stroke or coronary artery diseases, managed to show that the restrictive pattern was associated with cognitive impairment 27 years later, and that also obstructive pattern significantly affected cognitive status, although to a lower extent. Of note, the two studies used a different cut-off to define airways obstruction: fixed FEV1/FVC ratio of 0.70 in the previous study (5) and the Lower Limit of Normal in the present study (6). Interestingly the latter classification has been shown to select more severe cases of airways obstruction in the elderly (8). Anyway, both ARIC studies support a stronger role of restrictive pattern than the obstructive pattern on cognitive impairment. In agreement with the current literature (9), the restrictive pattern was strongly associated with all features of the metabolic syndrome in the present article: at baseline subjects with restrictive pattern had a mean BMI of 30.3, 36.2% were treated with antihypertensive medications, 22.4% had diabetes, and they had lower HDL cholesterol and higher LDL cholesterol than the other subjects. In multivariable analysis the association between restrictive impairment and dementia/mild cognitive impairment persisted even after adjusting for fifteen well-known cardiovascular risk factors, although the odds ratio decreased from 1.92 (95% CI ) to 1.56 ( ) (Table 3). This suggests that the relation between restrictive pattern and cognitive impairment is partly mediated by metabolic/cardiovascular comorbidities. On the other hand, the strength of the association between obstructive pattern and cognitive impairment was much weaker (OR=1.30, ), but remained unchanged when adjusting for the same cardiovascular risk factor (OR=1.31, ). The authors adopted an interesting study design, by integrating information from administrative databases with information from an ad hoc comprehensive neurocognitive exam. Administrative databases allowed to study the whole cohort (n=14,184 subjects), but
3 Page 3 of 5 lack sensitivity with respect to hospitalization and death for dementia, as acknowledged by the authors in the limitations section. Of note, also respiratory diseases are difficult to identify through administrative databases: in an Italian study (10) sensitivity was 53% for COPD and even lower (39%) for asthma. Indeed the association between lung diseases and incident dementia, identified by hospitalization diagnosis codes, was not significant after adjusting for smoking, while among lung function parameters only forced vital capacity percent predicted (FVC%) presented a borderline significant association with incident dementia after adjusting for cardiovascular risk profile (Table 2). Conversely the ad hoc follow-up survey suffered from low participation (42%), which was mostly due to 36.7% participants having died during the follow-up. Interestingly participants and non-participants still alive had similar baseline characteristics, and largely differed from deceased (supplementary Table 1). The authors coped with potential selection bias in multivariable analysis by adopting inverse probability weighting, where larger weights were assigned to subjects less likely to participate. Anyway, the problem of low participation is not avoidable in longitudinal studies with long follow-up. Moreover, exposure-outcomes associations seem to be less affected by loss to follow-up than prevalence estimates (11). The study by Lutsey and colleagues (6) has some limitations in baseline assessment of lung function and respiratory diseases, as acknowledged by the authors themselves. Indeed bronchodilation was not used and total lung capacity was not quantified. Due to these limitations, the authors adopted the expressions restrictive impairment pattern and COPD pattern. However, while causes of obstructive pattern (asthma, chronic bronchitis, emphysema) were enquired, baseline assessment did not investigate potential causes of restrictive pulmonary pattern, such as tuberculosis, pleural disease, pneumonia, occupational dust exposure (silica, asbestos). It should be reminded that bronchodilation and assessment of total lung capacity, although required in the clinical setting (12), were seldom used in
4 Page 4 of 5 epidemiological studies performed in the Eighties. However, future epidemiological studies should consider assessment of post-bronchodilation lung function (13) and total lung capacity, at least in subsamples. Moreover a recent ARIC study (14) showed that lung function decline, assessed in the first years of follow-up, was associated with an increased cardiovascular risk in the subsequent twenty years; the same approach could be used to study cognitive decline. In conclusion, restrictive lung disease, and to a lower extent obstructive disease, can be considered a predictor of cognitive decline. Cognitive impairment may further contribute to the risk of poor adherence to the management of respiratory disorders and non-pulmonary diseases. Forced vital capacity, originally a measure of lung function, can be viewed as a nonspecific index of overall health, like body temperature, heart rate, c-reactive protein. Further studies are needed to evaluate the combined effects of respiratory, cardiovascular and metabolic diseases on cognitive decline. Loss to follow-up is not avoidable in longitudinal studies with decades of follow-up, nevertheless possible selection bias must be addressed by comparing participants and nonparticipants, combining ad hoc surveys with administrative databases, and adopting innovative statistical methods. References 1. Fabbri LM, Rabe KF. From COPD to chronic systemic inflammatory syndrome? Lancet 2007; 370: Barnes PJ. Chronic obstructive pulmonary disease: effects beyond the lungs. PLoS Med 2010; 7: e Mannino DM, Thorn D, Swensen A, Holguin F. Prevalence and outcomes of diabetes, hypertension and cardiovascular disease in COPD. Eur Respir J 2008; 32: Mullerova H, Agusti A, Erqou S, Mapel DW. Cardiovascular comorbidity in COPD. Systematic literature review. Chest 2013; 144: Pathan SS, Gottesman RF, Mosley TH, Knopman DS, Sharrett AR, Alonso A. Association of lung function with cognitive decline and dementia: the Atherosclerosis Risk in Communities (ARIC) Study. Eur J Neurol 2011; 18:
5 Page 5 of 5 6. Lutsey PL, Chen N, Mirabelli MC, Lakshminarayan K, Knopman DS, Vossel KA, et al. Impaired lung function, lung disease and risk of incident dementia. Am J Respir Crit Care Med [online ahead of print] 15 Nov 2018; 7. ARIC Investigators. The Atherosclerosis Risk in Communities (ARIC) study: Design and objectives. Am J Epidemiol 1989; 129: Mannino DM, Buist AS, Vollmer WM. Chronic obstructive pulmonary disease in the older adult: what defines abnormal lung function? Thorax 2007; 62: Godfrey MS, Jankowich MD. The vital capacity is vital. Epidemiology and clinical significance of the restrictive spirometry pattern. Chest 2016; 149: Biffi A, Comoretto R, Arfè A, Scotti L, Merlino L, Vaghi A, et al, for CRD Real-World Evidence scientific board. Can healthcare utilization data reliably capture cases of chronic respiratory diseases? A cross-sectional investigation in Italy. BMC Pulm Med 2017; 17: Johannessen A, Verlato G, Benediktsdottir B, Forsberg B, Franklin K, Gislason T, et al. Longterm follow-up in European respiratory health studies - patterns and implications. BMC Pulm Med 2014; 14: Scarlata S, Pedone C, Conte ME, Antonelli Incalzi R. Accuracy of spirometry in diagnosing pulmonary restriction in elderly people. J Am Geriatr Soc 2009; 57: Lytras T, Kogevinas M, Kromhout H, Carsin AE, Antó JM, Bentouhami H, et al. Occupational exposures and 20-year incidence of COPD: the European Community Respiratory Health Survey. Thorax 2018; 73: Silvestre OM, Nadruz W Jr, Roca GQ, Claggett B, Solomon SD, Mirabelli MC, et al. Declining lung function and cardiovascular risk The ARIC Study. J Am Coll Cardiol 2018; 72:
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